org.apache.jasper.util.SimplePool Maven / Gradle / Ivy
/*
* Copyright 1999,2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.jasper.util;
/**
* Simple object pool. Based on ThreadPool and few other classes
*
* The pool will ignore overflow and return null if empty.
*
* @author Gal Shachor
* @author Costin
*/
public final class SimplePool {
/*
* Where the threads are held.
*/
private Object pool[];
private int max;
private int current=-1;
Object lock;
public static final int DEFAULT_SIZE=16;
public SimplePool() {
this.max=DEFAULT_SIZE;
pool=new Object[max];
lock=new Object();
}
public SimplePool(int max) {
this.max=max;
pool=new Object[max];
lock=new Object();
}
public void set(Object o) {
put(o);
}
/**
* Add the object to the pool, silent nothing if the pool is full
*/
public void put(Object o) {
synchronized( lock ) {
if( current < (max-1) ) {
current += 1;
pool[current] = o;
}
}
}
/**
* Get an object from the pool, null if the pool is empty.
*/
public Object get() {
Object item = null;
synchronized( lock ) {
if( current >= 0 ) {
item = pool[current];
current -= 1;
}
}
return item;
}
/**
* Return the size of the pool
*/
public int getMax() {
return max;
}
}